Construction Techniques for the Trumpet Section of Fanjiaping Tunnel
(1 Construction Headquarters of Lanzou-Chongqing Railway, China Railway No.18 Construction Bureau Group Co., Ltd., Wudu 746041; 2 Quality and Safety Supervision Station,the Ministry of Railways, Beijing 100844)
Abstract:
Fanjiaping tunnel is a large-span railway tunnel typically transformed from double-track to two single-track section by means of a trumpet section. The project adopted the reverse excavation from single-track to double-track section, combined with the section-variable rack of integral hydraulic jumbo to cast the secondary lining at large-span section with the help of small formwork.. The paper focuses on the construction option comparison, construction procedure and construction effect of the project.